EP3105479B1 - Valve means - Google Patents
Valve means Download PDFInfo
- Publication number
- EP3105479B1 EP3105479B1 EP15705552.6A EP15705552A EP3105479B1 EP 3105479 B1 EP3105479 B1 EP 3105479B1 EP 15705552 A EP15705552 A EP 15705552A EP 3105479 B1 EP3105479 B1 EP 3105479B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve plug
- outlet
- recess
- valve
- area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/14—Control of fluid pressure with auxiliary non-electric power
- G05D16/18—Control of fluid pressure with auxiliary non-electric power derived from an external source
- G05D16/185—Control of fluid pressure with auxiliary non-electric power derived from an external source using membranes within the main valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
- F16K3/24—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members
- F16K3/246—Combination of a sliding valve and a lift valve
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/024—Controlling the inlet pressure, e.g. back-pressure regulator
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/04—Control of fluid pressure without auxiliary power
- G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
- G05D16/063—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane
- G05D16/0638—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane characterised by the form of the obturator
Definitions
- the present invention relates to a valve means, in particular to a valve means for regulating the flow of food stuff containing pulp or other particulate matter.
- Constant pressure valves of the type referred to in the present disclosure may advantageously be used in food-processing applications, and they are commonly used in most heat treatment modules. Some examples include applications where a temperature exceeding 100 °C is used, in which case a pressurization of the system may be needed in order to avoid boiling. In such applications a counter pressure valve may be utilized. Another application relates to a situation where a particular pressure difference is to be maintained between two fluidly connected systems, e.g. the treated side and the untreated side of a pasteurization module. A third application is in a system where a particular and constant counter pressure is to be maintained in systems where the capacity or product routing may vary.
- Positioning of the counter pressure valve may vary, yet for a typical food processing system a counter pressure valve may be arranged after a product outlet from a cooling section while before a filling machine, as well as in a return pipe from a filler to a balance tank.
- a constant pressure valve having a housing with an inlet and an outlet, the outlet being selectively and adjustably blocked by a valve plug movable in an axial direction to adjust the blockage of the outlet.
- the valve plug has a single recess.
- the recess extends along only a part of the full circumference of the valve plug, creating a well defined recess.
- the valve plug has a cylindrical cross section and the recess extends from a free end of the valve plug.
- the recess is defined by a first area coinciding with a portion of the curved side surface of the cylinder and a second area coinciding with a portion of an end surface of the cylinder, wherein the first and the second area have a common interface.
- the common interface is the virtual border between the curved side surface of the cylindrical valve plug and the - circular - end surface of the cylindrical valve plug, basically saying that the recess may be an open recess rather than a through-hole through the cylindrical valve plug.
- the shape of the first area it may be defined as having a combination of any or all of the following features:
- the curved connector may have any of the shapes, semicircular, semielliptical, triangular, triangular with a curved upper corner, etc.
- a depth of the recess as measured from the first surface is decreasing fully or locally as a function of distance from the free end of the valve plug. This means that the depth may have a continuous decrease or that the depth may be decrease in some segments and be constant in other segments.
- the valve of Fig. 1 comprises a housing 102 having a product inlet 104 and a product outlet 106, wherein a valve plug 108 is arranged to selectively block the product outlet.
- a valve stem 110 extends from the valve plug 108 to a valve guide 112 being slidably arranged in relation to the housing 102.
- the housing the interior thereof, is operationally divided in two parts by a partition formed by a resilient membrane 114 sealingly attached to the valve stem/valve guide and an interior wall of the housing 102.
- the membrane 114 divides the interior of the valve housing in a lower space 116 through which product will flow and an upper space 118.
- a fluid inlet 120 enables fluid connection between the upper space and a source of pressurized fluid, such as pressurized air, in order to control a pressure in the upper space 118.
- Fig. 2 illustrates what will happen if the pressure in the lower space (product line) decreases.
- the resilient membrane which may be made of EPDM rubber or other resilient material suitable for the purposes, will be pulled downwards and consequently the valve plug 108 will gradually choke the product outlet 106. This will cause the product pressure to increase. If the product pressure increases too much the membrane will instead be pushed upwards (again referring to the directions as illustrated in the drawings) effectively pulling the valve plug 108 with it and gradually open the product outlet 106, thus reducing the product pressure.
- the pressure in the upper chamber is adjustable and by setting to a specific level it will be possible to set a desired product pressure.
- valve plug 108 it is of standard design, having a number of triangular recesses 122 and may be formed from a hollow or solid cylinder.
- the valve stem 110 is illustrated as an extension of the same cylinder, yet this is mainly for simplicity.
- the valve stem may have any suitable shape for transferring the movement from the membrane 114 to the valve plug 108.
- the membrane 114 is only schematically illustrated.
- its configuration is more complex, often comprising a multilayered structure.
- a valve plug having the configuration of Fig.4 and Fig. 5 .
- the features of Fig. 4 should be readily understood from the previous description of Figs. 1-3 .
- the main difference is found in the valve plug 208, which for that reason has been given a different reference numeral, the other reference numerals for like components being the same as in Figs. 1-3 .
- the embodiment of Fig. 4 instead of having a number of recesses the embodiment of Fig. 4 only have the one 222. Furthermore this recess 222 has a smoothly curved design.
- Fig. 5 illustrates the valve plug 208 in some closer detail.
- Fig. 6 illustrates the valve plug from the side and from below, and from that it is readily understood that the shape of the recess 222 may be defined by a first area A1 coinciding with a portion of the curved side surface of the cylinder and a second area A2 coinciding with a portion of an end surface of the cylinder, wherein the first and the second area have a common interface. These areas are then connected in a suitable way in order to form the volume of the recess 222. What is considered as being "a suitable" way may depend on the application. For example, the shape as illustrated in Fig.
- the recess may also be machined in another, more or less complex, manner depending on the material used for the valve plug, the requirements of the interior surfaces of the recess etc. Given the specified task a person skilled in machining, or moulding or milling could with relative ease suggest a cost efficient way of accomplishing the recess.
- the roughness of the surface of the recess may be matter more influenced by cleanability than of performance. For applications where the valve plug is made from a hollow cylinder it may be in most cases be sufficient to perform machining of the first area only, while the second area will have a generally circular shape defined by the hole in the cylinder and the interface with the first area.
- the shape of the first area in its interaction with the outlet, will have the greatest impact on the performance of the valve plug in regard of the variability.
- Some examples of the shape includes semicircular, semielliptical, triangular, rectangular with rounded upper corners, two rectilinear lateral side edges extending from the free end of the valve plug and having a curved connector connecting the lateral side edges so as to form a somewhat rounded and/or tapered end.
- the first area will be connected to the second area, which is self evident from the definition of the first and the second area, respectively. How these areas are connected, i.e. the interior design of the recess may vary, as mentioned above. It is foreseeable to have a smoothly curved surface to enable an even flow and enable good cleanability, yet it may also be possible to have a gradually decreasing depth as measured from the first area so as to increase a throttling effect as the valve is closing. The depth should then decrease as a function of the distance from the free end of the cylinder, and this does not exclude segments having a constant depth. In this way a cross section available for the flow as it passes the recess may assist in throttling the flow, such that the full pressure drop is not accomplished by the first area.
- a material commonly used within the field of food processing is stainless steel, and this may be a suitable material for use in the valve plug.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
- Safety Valves (AREA)
Description
- The present invention relates to a valve means, in particular to a valve means for regulating the flow of food stuff containing pulp or other particulate matter.
- Constant pressure valves of the type referred to in the present disclosure may advantageously be used in food-processing applications, and they are commonly used in most heat treatment modules. Some examples include applications where a temperature exceeding 100 °C is used, in which case a pressurization of the system may be needed in order to avoid boiling. In such applications a counter pressure valve may be utilized. Another application relates to a situation where a particular pressure difference is to be maintained between two fluidly connected systems, e.g. the treated side and the untreated side of a pasteurization module. A third application is in a system where a particular and constant counter pressure is to be maintained in systems where the capacity or product routing may vary.
- Positioning of the counter pressure valve may vary, yet for a typical food processing system a counter pressure valve may be arranged after a product outlet from a cooling section while before a filling machine, as well as in a return pipe from a filler to a balance tank.*
- In the detailed description a constant pressure valve of prior art is described in some detail referring to
Fig. 1 . The present disclosure relates to an improved or optimized constant pressure valve. Further prior art is reflected by patent documentsWO2012/178132A1 ,WO2012/171950A1 ,DE2139136A1 ,US4742987A andUS4208031A . - In order to eliminate or alleviate drawbacks with present constant pressure valves the present disclosure suggests a constant pressure valve having a housing with an inlet and an outlet, the outlet being selectively and adjustably blocked by a valve plug movable in an axial direction to adjust the blockage of the outlet. The valve plug has a single recess.
- The use of a single recess enables an effective area or cross section being the same as the one of prior art valves while the continuous cross section available for passage of product is larger. One effect of this difference is that the interaction between the valve plug and particulate matter in the product, such as the pulp of a fruit juice, will be gentler.
- The recess extends along only a part of the full circumference of the valve plug, creating a well defined recess.
- The valve plug has a cylindrical cross section and the recess extends from a free end of the valve plug.
- The recess is defined by a first area coinciding with a portion of the curved side surface of the cylinder and a second area coinciding with a portion of an end surface of the cylinder, wherein the first and the second area have a common interface. The common interface is the virtual border between the curved side surface of the cylindrical valve plug and the - circular - end surface of the cylindrical valve plug, basically saying that the recess may be an open recess rather than a through-hole through the cylindrical valve plug.
- To give a few examples of the shape of the first area it may be defined as having a combination of any or all of the following features:
- two lateral sides extending from the free end of the valve plug and being connected with curved connector at their remote end,
- semicircular,
- semielliptical,
- triangular.
- The curved connector may have any of the shapes, semicircular, semielliptical, triangular, triangular with a curved upper corner, etc.
- A depth of the recess as measured from the first surface is decreasing fully or locally as a function of distance from the free end of the valve plug. This means that the depth may have a continuous decrease or that the depth may be decrease in some segments and be constant in other segments.
-
-
Fig. 1 illustrates a prior art constant pressure valve in a schematic drawing thereof. -
Fig. 2 illustrates the constant pressure valve ofFig. 1 in a first operating position. -
Fig. 3 illustrates the constant pressure valve ofFig. 1 in a second operating position. -
Fig. 4 is a schematic view of a constant pressure valve according to a first embodiment. -
Fig. 5 is a view from the front and a view from the left of a valve plug that may be used in the constant pressure valve ofFig. 4 . -
Fig. 6 is a side view and an end view of a valve plug. - The operation of a constant pressure valve of the type used for food-processing application is well known per se. A
prior art valve 100 is shown inFig. 1 , while the general working principle of the same will be explained in relation toFigs. 2 and 3 . The valve ofFig. 1 comprises ahousing 102 having aproduct inlet 104 and aproduct outlet 106, wherein avalve plug 108 is arranged to selectively block the product outlet. Avalve stem 110 extends from thevalve plug 108 to avalve guide 112 being slidably arranged in relation to thehousing 102. The housing, the interior thereof, is operationally divided in two parts by a partition formed by aresilient membrane 114 sealingly attached to the valve stem/valve guide and an interior wall of thehousing 102. At this point it should be emphasized that the description still is schematic, and that further information is readily available at the Internet or via providers of constant pressure valves. Themembrane 114 divides the interior of the valve housing in alower space 116 through which product will flow and anupper space 118. Afluid inlet 120 enables fluid connection between the upper space and a source of pressurized fluid, such as pressurized air, in order to control a pressure in theupper space 118. - The operational principle of the constant pressure valve is readily understood from the description of
Figs. 2 and 3 . Given a specific pressure in the upper space,Fig. 2 illustrates what will happen if the pressure in the lower space (product line) decreases. The resilient membrane, which may be made of EPDM rubber or other resilient material suitable for the purposes, will be pulled downwards and consequently thevalve plug 108 will gradually choke theproduct outlet 106. This will cause the product pressure to increase. If the product pressure increases too much the membrane will instead be pushed upwards (again referring to the directions as illustrated in the drawings) effectively pulling thevalve plug 108 with it and gradually open theproduct outlet 106, thus reducing the product pressure. The pressure in the upper chamber is adjustable and by setting to a specific level it will be possible to set a desired product pressure. - Looking a bit closer at the
valve plug 108 it is of standard design, having a number oftriangular recesses 122 and may be formed from a hollow or solid cylinder. Thevalve stem 110 is illustrated as an extension of the same cylinder, yet this is mainly for simplicity. In a practical situation the valve stem may have any suitable shape for transferring the movement from themembrane 114 to thevalve plug 108. Furthermore, themembrane 114 is only schematically illustrated. In a practical situation its configuration is more complex, often comprising a multilayered structure. These details and more are readily available to the skilled person. The triangular recesses vouches for a wide control interval in terms of flow, e.g. as measured in m3/h (a measure often referred to as Kv) - To address these issues the present disclosure suggests a valve plug having the configuration of
Fig.4 and Fig. 5 . The features ofFig. 4 should be readily understood from the previous description ofFigs. 1-3 . In theconstant pressure valve 200 ofFig. 4 the main difference is found in the valve plug 208, which for that reason has been given a different reference numeral, the other reference numerals for like components being the same as inFigs. 1-3 . Instead of having a number of recesses the embodiment ofFig. 4 only have the one 222. Furthermore thisrecess 222 has a smoothly curved design. -
Fig. 5 illustrates the valve plug 208 in some closer detail. -
Fig. 6 illustrates the valve plug from the side and from below, and from that it is readily understood that the shape of therecess 222 may be defined by a first area A1 coinciding with a portion of the curved side surface of the cylinder and a second area A2 coinciding with a portion of an end surface of the cylinder, wherein the first and the second area have a common interface. These areas are then connected in a suitable way in order to form the volume of therecess 222. What is considered as being "a suitable" way may depend on the application. For example, the shape as illustrated inFig. 6 could be accomplished by drilling (or milling) a circular hole with a first radius from below, in combination with drilling (or milling) a circular hole with a second radius (which may or may not equal the first radius) from one side to form the arcuate shape of the first area. However, the recess may also be machined in another, more or less complex, manner depending on the material used for the valve plug, the requirements of the interior surfaces of the recess etc. Given the specified task a person skilled in machining, or moulding or milling could with relative ease suggest a cost efficient way of accomplishing the recess. The roughness of the surface of the recess may be matter more influenced by cleanability than of performance. For applications where the valve plug is made from a hollow cylinder it may be in most cases be sufficient to perform machining of the first area only, while the second area will have a generally circular shape defined by the hole in the cylinder and the interface with the first area. - The shape of the first area, in its interaction with the outlet, will have the greatest impact on the performance of the valve plug in regard of the variability. Some examples of the shape includes semicircular, semielliptical, triangular, rectangular with rounded upper corners, two rectilinear lateral side edges extending from the free end of the valve plug and having a curved connector connecting the lateral side edges so as to form a somewhat rounded and/or tapered end. In a more general aspect it may be beneficial to have a single first area (only one recess) having a shape being tapered in the remote end, while still avoiding sharp edges, such as to avoid to the largest possible extent damage of particulate matter contained in the product, one example being the pulp of a fruit juice.
- The first area will be connected to the second area, which is self evident from the definition of the first and the second area, respectively. How these areas are connected, i.e. the interior design of the recess may vary, as mentioned above. It is foreseeable to have a smoothly curved surface to enable an even flow and enable good cleanability, yet it may also be possible to have a gradually decreasing depth as measured from the first area so as to increase a throttling effect as the valve is closing. The depth should then decrease as a function of the distance from the free end of the cylinder, and this does not exclude segments having a constant depth. In this way a cross section available for the flow as it passes the recess may assist in throttling the flow, such that the full pressure drop is not accomplished by the first area.
- A material commonly used within the field of food processing is stainless steel, and this may be a suitable material for use in the valve plug.
Claims (2)
- A constant pressure valve (200) having a housing (102) with an inlet (104) and an outlet (106), the outlet (106) being selectively and adjustably blocked by a valve plug (108) movable in an axial direction of the valve plug (108) to adjust the blockage of the outlet (106), wherein
the valve plug (108) has a single recess (222),
the recess (222) extends along only a part of a full circumference (1081) of the valve plug (108),
the valve plug (108) has a cylindrical shape and
the recess (222) extends from a free end (1082) of the valve plug (108), characterized in that
the recess (222) is defined by a first area (A1) coinciding with a portion of a curved side surface (1083) of the cylindrical shape and a second area (A2) coinciding with a portion of the free end (1082) of the cylindrical shape, wherein the first and the second areas (A1, A2) have a common interface,
a depth (D1) of the recess (222) as measured from the side surface (1083) is decreasing fully or locally as a function of a distance (D2) from the free end (1082) of the valve plug (108), and
the outlet (106) is substantially perpendicular to the inlet (104) and the valve plug (108) is movable in the axial direction of the valve plug (108) and the outlet (106) towards the outlet (106) to gradually choke the outlet (106) and away from the outlet to gradually open the outlet (106). - The constant pressure valve of claim 1, wherein the first area (A1) may be defined as having a combination of any or all of the following features:- two lateral sides extending from the free end of the valve plug (108) and being connected with curved connector at their remote end,- semicircular,- semielliptical,- triangular.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1450137 | 2014-02-10 | ||
PCT/EP2015/052700 WO2015118162A1 (en) | 2014-02-10 | 2015-02-10 | Valve means |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3105479A1 EP3105479A1 (en) | 2016-12-21 |
EP3105479B1 true EP3105479B1 (en) | 2019-11-27 |
Family
ID=52544465
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15705552.6A Active EP3105479B1 (en) | 2014-02-10 | 2015-02-10 | Valve means |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3105479B1 (en) |
WO (1) | WO2015118162A1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE411791B (en) * | 1977-05-20 | 1980-02-04 | Alfa Laval Ab | CONTROL VALVE INCLUDING A MEMBRANE WALL AND A CENTRAL PART OF THE MEMBRANE WALL FIXED VALVE BODY |
JPS6084482A (en) * | 1983-10-15 | 1985-05-13 | Yamatake Honeywell Co Ltd | Valve |
EP2535622A1 (en) * | 2011-06-15 | 2012-12-19 | Delphi Technologies Holding S.à.r.l. | Valve assembly |
EP2724060B1 (en) * | 2011-06-24 | 2019-11-27 | Equilibar, LLC | Back pressure regulator with floating seal support |
-
2015
- 2015-02-10 WO PCT/EP2015/052700 patent/WO2015118162A1/en active Application Filing
- 2015-02-10 EP EP15705552.6A patent/EP3105479B1/en active Active
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
EP3105479A1 (en) | 2016-12-21 |
WO2015118162A1 (en) | 2015-08-13 |
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